tengo lo siguiente:
const array = [{value: 'banana'}, {value: 'apple'}, {value: 'yellow'}, {value: 'red'}]
Necesito lo siguiente:
const result = [{banana: 'yellow'}, {apple: 'red'}];
¿Hay alguna forma de crear resultados a partir de la matriz, utilizando bucles o funciones de orden superior en JavaScript?
Puedes usar Array.prototype.flatMap :
const flatMapToEntry = (key, index, array) => { const length = array.length / 2; if (index >= length) { return []; } const value = array[index + length]; return [{ [key]: value }]; }; const result = array.map(o => o.value).flatMap(flapMapToEntry);Aquí hay una respuesta que usa la misma lógica provista en el comentario. Esto tiene descripciones relevantes para ayudar a entender mejor.
const getMyObject = arr => { // first compuate the half-length "lenBy2" of given array const lenBy2 = Math.floor(arr.length / 2); // return the "result" as an object return Object .fromEntries( // generate object from key-value pairs below arr.map( // iterate "arr" to obtain key-value pairs ({ value }, idx) => ( // get the index "idx" and de-structure to access "value" idx < lenBy2 // if index less than half-length "lenBy2" ? [ // return key-value pair as a 2-element array value, // [ "banana", "yellow" ], for example arr[idx + lenBy2]?.value ] : [] // if index >= half-length, return empty array ) ).filter( // filter key-value pairs to retain only non-empty ones x => x.length == 2 ) ); }; // below are steps only to generate results for various test cases // the original array from the question const array1 = [{value: 'banana'}, {value: 'apple'}, {value: 'yellow'}, {value: 'red'}]; // test-case 2 - an array with 3 pairs const array2 = [ {value: 'banana'}, {value: 'apple'}, {value: 'tomato'}, {value: 'yellow'}, {value: 'green'}, {value: 'red'} ]; // mismatched array where the fruit "orange" has no matching color const array3 = [ {value: 'banana'}, {value: 'apple'}, {value: 'orange'}, {value: 'yellow'}, {value: 'red'} ]; // mismatched array where the color "orange" has no matching fruit const array4 = [ {value: 'banana'}, {value: 'apple'}, {value: 'yellow'}, {value: 'red'}, {value: 'orange'} ]; // iterate over the various test case arrays & // console.log the result [array1, array2, array3, array4].forEach((arr, idx) => console.log( `\n***---> test case ${idx + 1} <---***\n`, 'given array: 👉 ', JSON.stringify(arr), '\n\nresult object: 👇 \n', getMyObject(arr), '\n ***---> end of result <---*** \n\n' ) ); .as-console-wrapper { max-height: 100% !important; top: 0 }Siéntase libre de publicar preguntas en los comentarios, en caso de que no esté claro cómo funciona lo anterior.